The downsides to your 2001 is that you are only allowed just 1 monitor to not set in order for it to pass emissions. If you had a 1996-2000 model you are allowed up to 2 not to set, and they could be any 2. Most cars after having work done will have some monitors that will have to sit over night in order for the code to set, but on others the monitors will set immediately, depending on the amount of gas that's in the tank and if whether or not all of the demands have been met. I've seen cars that don't even have the MIL light on and will still fail because the monitors haven't and it will go on for at least 200+ miles. So depending on the vehicle, I'd rather have to drive the car on the dyno to get it to pass rather than to have it plugged it. There's so much you can do with it. With OBDII you have to fool the computer or fix the problem to pass. That costs money sometimes.Originally Posted by Nick
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